that looks like a powerfull toolkit to me... I also did find others which offer zmodem-functionality; most of them at the same price as stated at hallogram.
I am not going to pay $400 for a freeware-project on empeg though. If anyone has this toolkit, they could generate a DLL which has got the zmodem routines in and distribute it freely. At least that's what it says at the page :

License Information
Executables developed using SuperCom can be distributed royalty free.



Frank van Gestel
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Frank van Gestel